Two-dimensional direct simulation of deuterium-fiber-initiated Z pinches with detailed comparison to experiment

Sheehey, P.T.; Hammel, J.E.; Lindemuth, I.R.; Scudder, D.W.; Shlachter, J.S.; Lovberg, R. H.; Riley, R.E.

doi:10.1063/1.860325

Cited by 33 publications

(13 citation statements)

References 20 publications

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“…It was once hoped that such an approach could lead to very dense, anomalously stable 2-pinch fusion plasmas, but plasmas generated on machines scaled up to potentially reach fusion conditions, such as Los Alamos' HDZP-2, displayed explosive instability as currents and temperatures w m increased, dropping densities far below those desired for fusion applications [9,10]. However, a deuteriumfiber-initiated 2-pinch might well produce an acceptably hot, dense, magnetized target plasma for subsequent MTF compression to fusion conditions.…”

Section: Fiber Zipinch Target Plasmasmentioning

confidence: 99%

Computational modeling of pulsed-power-driven magnetized target fusion experiments

Sheehey

Kirkpatrick²,

Lindemuth³

Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference

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Direct magnetic drive using electrical pulsed power has been considered impractically slow for traditional inertial confinement implosion of fusion targets. However, if the target contains a preheated, magnetized plasma, magnetothermal insulation may allow the near-adiabatic compression of such s target to fusion conditions on a much slower time scale. 100-MJ-class explosive flux One means of obtaining the preheated and magnerized plasma required for an MTF system is the rtcently reported "MAGO" concept [5,6]. MAGO is a unique, explosive-pulsed-power driven discharge in two cylindrical chambers joined by an annular nozzle. Joint Russian-American MAGO experiments have reported D-T neutron yields in excess of 10" from this plasma preparation stage alone, without going on to the proposed separately driven M7'F implosion of the main plasma chamber. Two-dimensional MHD computational modeling of MAGO discharges shows good agreement to experiment. The calculations suggest that after the observed neutron pulse, a diffuse 2-pinch plasma with temperature in excess of 100 eV is created, which may be suitable for subsequent MTF implosion, in a heavy liner magnetically driven by explosive pulsed power. Other MTF conctpts, such as fiber-initiated Zpinch target plasmas, are also being computationally and theoretically evaluated. The status of our modeling efforts will be reported.

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Section: Fiber Zipinch Target Plasmasmentioning

confidence: 99%

Computational modeling of pulsed-power-driven magnetized target fusion experiments

Sheehey

Kirkpatrick²,

Lindemuth³

Digest of Technical Papers. Tenth IEEE International Pulsed Power Conference

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“…Fiber Z-pinch experiments were carried out on modern highvoltage pulsed-power generators at Los Alamos National Laboratory [1], [4], [6], [7], Naval Research Laboratory [2], [19], Imperial College in London [8]- [13], Kernforschungszentrum Karlsruhe [5], and Kurchatov Institute in Moscow [20]. Even though each experimental group observed somewhat a different behavior of a fiber Z-pinch, the gross dynamics of a fiber pinch was described.…”

Section: A Fiber Z-pinch Experimentsmentioning

confidence: 99%

Imploding$Z$-Pinch Plasmas Formed From a Carbon Fiber

Klír

Kubeš

Kravárik

2006

IEEE Trans. Plasma Sci.

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Z-pinch experiments, which are formed from a 15-µm diameter carbon fiber in a vacuum, were conducted using a simple capacitor bank. After the breakdown, a low-density coronal plasma was formed while the fiber diameter remained almost unchanged. This low-density corona (ion density of about 10 16 cm −3 ) was carrying almost all the current of the order of 10 kA. When the current had built up, i.e., after about 150 ns, the implosion of the corona onto the central fiber occurred. The implosion velocity approached the value of 2 · 10 5 m/s. When the imploded corona had reached the fiber, the dip in dI/dt, a voltage peak up to 10 kV and an extreme-ultraviolet (XUV) pulse of a 10-30-ns width were observed. XUV radiation was emitted from several bright spots, which corresponded to the interaction of m = 0 instability necks with the dense core. The electron temperature and density were approximately 80 eV and 10 19 cm −3 , respectively. Although the presence of a fiber did not significantly suppress MHD instabilities, they were not disruptive. After the fiber ablation, i.e., after 500 ns, the material evaporated from the electrodes started to play a dominant role. When MHD instabilities had developed in the imploding plasma column, XUV, soft X-ray, and hard X-ray pulses were emitted from several bright spots, particularly near the anode. At that time, the voltage peak of up to 30 kV was detected. The measurement of voltage and current enabled the determination of a plasma resistance and the energetics of the Z-pinch.

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“…The code is an adaptation and enhancement of the radiation-MHD simulation code MHRDR (Magneto-Hydro-Radiative-Dynamics-Research, developed by Irvin Lindemuth et al of LANL). MHRDR has successfully been applied for modeling of gas discharges in one and two dimensions, with a full three-temperature model (including a separate radiation fluid), a two-temperature model (ions and electrons or material and radiation), or a basic one-temperature model [3][4][5][6][7][8] . The MHRDR code also previously predicted well the behavior of a laser-initiated, gas-embedded z-pinch 9 .…”

Section: Introductionmentioning

confidence: 99%

Development of laser deposition package for modeling of EUV sources for microlithography

et al. 2005

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A laser energy deposition model has been incorporated into the MHRDR-EUVL magnetohydrodynamic (MHD) model of EUV sources for microlithography. The model includes inverse-bremsstrahlung absorption, resonance absorption, and reflection of laser radiation from the plasma critical surface. The plasma evolution is simulated in parallel with the MHRDR-EUVL (Magneto-Hydro-Radiative-Dynamic-Research) 2D, three-temperature, MHD computer code. Convenient user-options include simple specification of the full width at half maximum (FWHM) of typical laser profiles, such as Gaussian profiles in space and time. The new laser deposition capability will allow MHRDR-EUVL to calculate the evolution of magnetized laser-produced plasmas. Magnetic fields can reduce the loss of plasma energy caused by plasma expansion and thermal conductivity.

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Two-dimensional direct simulation of deuterium-fiber-initiated Z pinches with detailed comparison to experiment

Cited by 33 publications

References 20 publications

Computational modeling of pulsed-power-driven magnetized target fusion experiments

Computational modeling of pulsed-power-driven magnetized target fusion experiments

Imploding$Z$-Pinch Plasmas Formed From a Carbon Fiber

Development of laser deposition package for modeling of EUV sources for microlithography

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